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Finding the Fourth Proportional to 64.25, 96.42 and 38.57

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Solution

The fourth proportional to 64.25, 96.42 and 38.57 is: 57.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.25 : 96.42 = 38.57 : x
  2. Step 2: Convert to fraction form
    64.25/96.42 = 38.57/x
  3. Step 3: Cross multiply
    64.25x = 96.42 × 38.57
  4. Step 4: Simplify right side
    64.25x = 3,718.92
  5. Step 5: Solve for x
    x = 3,718.92/64.25
  6. Step 6: Final answer
    x = 57.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.